Discussion
A rock aggregate is rejected after testing revealed pyrite. The concern is that in service it will
Answer: D
Correct answer: generate acid and sulphate and expand
Pyrite oxidises in air and moisture to iron oxide and sulphuric acid, and the acid then forms sulphates with the cement. The reaction products take up more space than the pyrite, so the aggregate expands and cracks the concrete, and the sulphate attacks the paste independently. Rust staining is the visible early sign.
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